Why is GA4 showing (direct) / none for my Shopify checkout sales?

When users navigate from WordPress to a separate Shopify domain checkout, GA4 loses client ID cookies and generates a brand-new session. GA4 Linker fixes this by automatically appending the _gl parameter to cross-domain links.

Does GA4 Linker support slide-out AJAX carts and popup checkout buttons?

Yes! The Pro and Agency plans use a high-performance MutationObserver that detects dynamically injected DOM elements and AJAX cart drawers in real-time.

Is coding required to set up GA4 Linker?

Zero coding required. Simply install the plugin, enter your Shopify checkout domain(s) in the WordPress admin panel, and GA4 Linker handles link and form decoration automatically.

How does GA4 Linker preserve UTM parameters?

On Personal, Pro, and Agency plans, GA4 Linker captures incoming utm_source, utm_campaign, utm_medium, and gclid parameters from your landing page and persists them through internal navigation directly into the Shopify checkout destination.

🎵 TikTok Click ID Forwarding

How to Pass ttclid Parameters Across Cross-Domain Links to Shopify

By Dimsquid Engineering•Published Aug 5, 2026•8 min read

When users tap a TikTok ad, TikTok attaches a Click ID query string (?ttclid=TT_CLICK_ID_123) to the landing page URL. If your store runs WordPress for content and Shopify for checkout, this parameter must be forwarded on outbound links to ensure TikTok Ads Manager attributes purchase revenue.

1. Why TikTok Pixel Requires ttclid Parameters

When a user clicks an ad inside the TikTok app, TikTok writes a first-party cookie named _ttp on your WordPress domain. When the user navigates over to checkout.myshopify.com, browser origin rules prevent Shopify from accessing the _ttp cookie.

By passing ttclid in the URL, the TikTok Pixel on Shopify rebuilds the session context and links the conversion to your ad account.

⚡ Automated Solution

2. The 60-Second Solution: GA4 Linker

GA4 Linker (Personal+ Plan) auto-attaches ttclid, _fbc, _fbp, and _gl parameters to outbound checkout links automatically.

Get Personal Plan ($49/yr) →